Electrical
I just bought a 3 year old home. The breaker box on the 2nd floor has 3 AFCI breakers (10kA), #10, 8, and 6. EXACTLY and without fail, every 6 days, all 3 trip in the same order (10, then 8, then 6), separated by several hours. There is nothing that we know of on a 6 day timer and the city...